Thumb tack



T. w. ANDERSON.

THUMB TACK. APPLICATION FILED MAR: 10, 1921.

'1 ,409,81 3 Patented Mar. 14, 1922.

UNITED STATES THORE W. ANDERSON, 0F ARLINGTON, MASSACHUSETTS.

THUMB TACK.

To all whom it may concern.

Be it known that I, -THORE W. ANDERSON,

a citizen of the United States, residing at- Arlington, in the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in Thumb Tacks; and I do hereby declare thefollowing to be a full, clear, and exact 'description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

The invention relates to fasteners for draftsmen, architects and artistsfor securing paper to the drawing board and has for 1ts primary objectthe provision of a thumb tack which may be applied in the usual way butwhich may be removed without marring the paper or straining the prongsand bending or breaking the same.

The invention consists of a thumb tac having a raised crown and amarginal flat rim roughened on its lower or engaging face to preventslipping, said crown having opposed slots and opposed prongs, the onebeing disposed opposite the spaces formed between the other.

Other objects and advantages will be apparent and suggest themselves asthe nature of the invention is understood.

While the drawings illustrate an embodi-; ment of the invention, it isto be understood that in adapting the same to meet different conditionsand requirements, various changes in the form, proportion and minordetails of construction may be resorted to without departing from thenature of the invention.

Referring to the accompanying drawings forming a part of thespecification, I

Figure 1 is a top plan view of a-thumb tack embodying the invention,

Figure 2 is a side view in line with the slots,

Figure 3 is a View similar to Figure 2 in line with the prongs, and

Figure 4 is an enlarged vertical central section showing a puller incooperative position.

Corresponding and like parts are referred to in the followingdescription and designated in the several views of the drawings by likereference characters.

Specification of Letters Patent.

Application filed March 10, 1921.

Patented Mar. 14, 1922.

Serial No. 451,325.

The fastener comprises a head of-circular form and a pair of opposedattaching prongs or points. The device is up from sheet metal of ropergage and temper and may be of any esired size. The head comprises amarginal fiat rim 1, and a raised crown 2. The attaching prongs orpoints 3 are disposed at diametrically opposite points and are set infrom the outer edge of the rim. Slots 4 are formed in raised crown 2 atdiametrically opposite oints adjacent the flat marginal rim 1. 'Fhe rim1 s corrugated or roughened to preventtearing and slipping.

The thumb tack is applied in the usua way. When it is required to removethe tack, theslots 4 come into play. A puller is provided and presentsthe form'substan-v tlally as illustrated in Figure 4, beingsubstantlally of U-shape and having inwardly extending nibs 6 of suchconstruction as to readily enter the slots 4 and admit of the tack beingwithdrawn by an upward pull on the device 5; It will thus be understoodthat the tackmay be withdrawn without SllbJBCtlDg the prongs 3 tolateral stress which usually results in bending or breaking the same,thereby rendering the tack unfit for further service. It is observedthat the slots 4 are disposed intermediate the prongs 3 and the latterin turn are located intermediatejhe slots 4. The force applied to thepuller 5 when extractin the tack, is uniformly distributed on 83.51 ofthe prongs 3, and the latter are withdrawn by a dlrect pull in linetherewith which obviates any lateral strain with the resultantadvantages stated.

What is claimed is:

stamped or struck 1. A thumb tack comprising a head of.

circular form having a marginal flat rim and a centrally disposed raisedcrown, theposed intermediate the said slots.

3. A thumb tack comprising a head of eifcular form having a marginalfiat rim In testimony whereof I afiix my sign'atur and a centrallydisposed raised crown, the in presence of two witnesses.

marginal rim, said marginal rim being corlatter having opposed slotsadjacent the flat rugated 0r roughened, and a pair of prongs Witnesses:

disposed intermediate said slots and set in IDA ANDERSON,

-wardly from the outer edge of the rim. I QHNORE C. FRANCIS.

THORE W. ANDERSON. v

